package com.example.reggie.controller;


import com.example.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;

import java.io.IOException;
import java.util.UUID;

@Slf4j
@RestController
@RequestMapping("/common")
public class CommonController {


    @Value("${reggie.path}")
    private String basePath;

    /**
     * 文件上传
     *
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) {
        log.info("文件名上传:{}", file.toString());

        //截取原始文件名后缀
        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        //利用UUID获取随机id，避免重复id出现
        String fileName = UUID.randomUUID() + suffix;
        //创建一个目录对象
        File dir = new File(basePath);
        //判断是否存在
        if (!dir.exists()) {
            dir.mkdirs();
        }

        try {
            file.transferTo(new File(basePath + fileName));
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

        return R.success(fileName);
    }

    /**
     * 文件下载
     *
     * @param name
     * @param response
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) throws IOException {

        //输入流，读取文件内容
        FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));
        //输出流，写回浏览器
        ServletOutputStream outputStream = response.getOutputStream();

        //输出内容
        int len = 0;
        byte[] bytes = new byte[1024];
        while ((len = fileInputStream.read(bytes)) != -1) {
            outputStream.write(bytes, 0, len);
            outputStream.flush();
        }
        //响应文件类型
        response.setContentType("image/jpeg");
        outputStream.close();
        fileInputStream.close();

    }

}
